Using local register variable

Falk Hueffner falk.hueffner@student.uni-tuebingen.de
Tue Dec 30 17:13:00 GMT 2003


"Tal Agmon" <Tal.Agmon@nsc.com> writes:

> The manual says:
> You can define a local register variable with a specified register like
> this:
> register int *foo asm ("a5");
> 
> My question: is foo must be a pointer or can I define for example:
> register int y asm ("a5");

Both are legal.

> I'm asking this because in gcc-3.3.2 I saw (in a very simple program
> with no reason not the preserve a register) that a5 was not
> preserved for y, and when I defined it as in the first example, a5
> WAS preserved for foo.

I don't understand what you mean by "preserve", so I can't comment on
this...
> 

-- 
	Falk



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